Hi,
I like to galvanic isolate a rs485 shield from an Arduino.
There for I need 3 optocoupler in between the TX RX and Ctrl line
Can someone recommend me a common fast optocoupler ?
Appreciate in advance the answer,
Tom
http://www.digikey.com/product-search/en/isolators/optoisolators-logic-output/3736381?k=optoisolator
Filter on Propogation delay; lowest time = fastest repsonse
Could you use ADM2482 or similar.
6,5to 9.5$ at DigiKey, as always cheaper from China
Pelle
Seems kind of pricey. For $3.30 you can have a 30nS delay part.
TLP117(F)
15nS, 30nS, either way is <1 clock cycle delay.
<<There for I need 3 optocoupler in between the TX RX and Ctrl line>>
Well, 3x 3.33$ + some parts around.
Pelle
That's a valid way to look at it also.
Triple channel Isolator for Tx-Rx lines for 4 USD.
ISO7321 is for bidirectional communication, although Ctrl line goes only in one direction (I suppose you need from master to slaves, then that should work).
Lines A and C for bidirectional communication, line B for Ctrl line.
Datasheet http://www.ti.com/lit/ds/symlink/iso7231c.pdf
Piece http://www.digikey.com/product-detail/en/ISO7231CDW/296-22960-5-ND/1770136
That looks like a great part. Too bad it's SMD only, need a DIP adapter to play with it on a protoboard.